What was rené descartes' contribution to the scientific revolution? a. he used mathematics to prove that the earth revolves around the sun. b. he introduced the theory of universal gravitation. c. he wrote discourse on the method of rightly conducting the reason and seeking truth in the sciences. d. he said that mathematics could be used to explain everything in nature.

Which is one reason many african nations have not prospered after gaining independence from european colonial powers? a. colonial powers sent their weakest economic advisors to the new countries, and their recommendations were flawed. b. independence left them with weak economies, and many countries have been unable to overcome or recover from these burdens. c. the desert region of the interior is inhospitable to foreign investors, and business interests focused on the coastal mediterranean cities. d. the money endowed upon independence is still tied up in the bank of england, which is hesitant to make loans to struggling nations.